US3861188A - Rolling process and rolling stand of steel plate - Google Patents

Rolling process and rolling stand of steel plate Download PDF

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Publication number
US3861188A
US3861188A US420565A US42056573A US3861188A US 3861188 A US3861188 A US 3861188A US 420565 A US420565 A US 420565A US 42056573 A US42056573 A US 42056573A US 3861188 A US3861188 A US 3861188A
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United States
Prior art keywords
rolling
stand
roll
stands
working
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Expired - Lifetime
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US420565A
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English (en)
Inventor
Norimasa Kamit
Ryozi Terakado
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Nippon Steel Corp
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Nippon Steel Corp
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B2013/003—Inactive rolling stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter
    • B21B2267/065—Top and bottom roll have different diameters; Asymmetrical rolling

Definitions

  • ABSTRACT A process and a rolling mill for rolling thin plate by means of a tandem rolling mill characterized in that the diameter of either of the upper or the lower working rolls in optional rolling stands situated in the rear step of the tandem rolling mill for thin plate consisting of a plurality of rolling stands is chosen smaller than that of other corresponding working rolls and that the rolling work is carried out by driving only the working rolls with larger diameter.
  • SHEET 30F 4 ROLLING PROCESS AND ROLLING STAND OF STEEL PLATE SUMMARY or THE INVENTION The present invention relates to a rolling process to reduce the rolling load and thus enable the rolling of a thinner plate by means of a tandem rolling mill consisting of a plurality of rolling stands, and the rolling stand to carry out the process.
  • the present invention relates to a rolling process to roll checkered plates such as for flooring which present on the one surface checker patterns consisting of discontinuous unevenness or lengthwise checkered plates which present on the one surface lengthwise checker patterns consisting of continuous unevenness.
  • the increase of the diameter of the rolls of a rolling mill means the decrease of the ratio of the plate thickness to the roll diameter.
  • the average rolling pressure is greatly influenced by the ratio of the plate thickness to the roll diameter so that the average rolling pressure increases as the ratio decreases.
  • the contact length under the same rolling reduction is proportional to the square root of the roll diameter so that the rolling load is all the more increased.
  • the increase of the rolling speed and the decrease of the roll diameters means the increase of the rotational speed of the rolls, which as a result means the significant increase of rotational speed of the driving system of rolls.
  • the decrease of the roll diameter is not as important.
  • a roll presenting grooves corresponding to the patterns of the checkered plates as final products has been used as one of the final working rolls of the finishing rolling mill consisting of a plurality of the rolling stands such as for example hot strip mills and a flat roll as the other one.
  • the formation of the checker pattern has to be carried out in only one rolling stand, which means that a comparatively large rolling reduction is necessary to from unevenness with sufficient height i.e., sufficiently projecting parts. Therefore the grooved roll is exposed to a large rolling load so that the edges of the grooves are often broken or crushed.
  • the purpose of the present invention is to solve the above mentioned disadvantages of the conventional technics.
  • FIG. 1 shows a diagram showing the maximum and the minimum nominal driving torque of the seven conventional hot strip mill stands (tandem rolling mill for thin plates);
  • FIG. 2 shows a diagram showing the speed cones of the seven rolling stands
  • FIG. 3 shows a diagram showing the actual distances between rolls of the tandem rolling mill consisting of six rolling stands
  • FIGS. 4, 5, 6 and 7 show an embodiment of the present invention whereby
  • FIG. 4 shows a side view of the whole of the embodiment of a tandem rolling stand
  • FIG. 5 shows a front view of the fourth rolling stand of FIG. 4.
  • FIG. 6 shows an enlarged side view of the important part.
  • FIG. 7 shows another embodiment of the present invention
  • FIG. 8 shows a diagram for the explanation of the effect of the above embodiment.
  • FIG. I shows a diagram showing the maximum and the minimum nominal driving torques of the finishing rolling stand of the hot strip mill, in the present example of the tandem rolling mill consisting of seven rolling stands.
  • the maximum torque naturally takes place in the first rolling stand and the torque in the third rolling stand is already half of that of the first rolling stand. Further the torque in the fifth rolling stand is nearly one fifth as low. The same thing can at the same time be said of the minimum torques of the high rotation speed side of the rolling stand.
  • T in the drawing shows the driving torques of the rolling stands, whereby T, max. shows the maximum torque of the first rolling stand while T min. shows the minimum torque of the first rolling stand.
  • T max. shows the maximum torque of the second rolling stand
  • T min. shows the minimum torque of the second rolling stand.
  • the torques of the third to seventh rolling stand are indicated in the same way.
  • FIG. 2 shows a diagram showing the speed cones of the seven rolling stands, whereby it is shown that the increase of the speed in the rolling stands in the rear step is remarkable.
  • the mark X in the drawing showsthe maximum rotation speed of the motor, whereby a speed step up means is built in the seventh rolling stand to increase the roll speed.
  • the economy of adoption of the high power motor lies in this respect so that the decrease of the roll diameter presents many disadvantages.
  • FIG. 3 shows the actual value of the distance t between the upper and the lower working rolls in case thin plates with 1.2 mm thickness and 1.6 mm thickness are rolled in a continuous hot rolling.
  • the present case relates to an example of a tandem rolling mill consisting of six rolling stands.
  • the roll intervals in the diagram shows that the upper and the lower rolls in the third and the following rolling stands are nearly in the contacting states, whereby in the fourth rolling stand the upper and the lower rolls are completely in contact with each other in such a manner that a remarkable load already exists between the rolls before the plate material is put therebetwee.
  • the rolling stand is strong enough even if it is driven by only one roll.
  • the present invention is based upon the above mentioned consideration, and relates to (1) a process to roll thin plates by means of a tandem rolling stand characterized in that the diameter of either of the upper or the lower working rolls in optional rolling stands situated in the rear steps of the tandem rolling mill for thin plates consisting of a plurality of rolling stands is chosen smaller than that of other corresponding working rolls and that the rolling work is carried out by driving only the working rolls with larger diameter, (2) a tandem rolling mill for thin plates comprising a plurality of rolling stands characterized in that the diameter either of the upper or the lower working roll at least in one rolling stand situated in the rear step of the tandem rolling mill is chosen smaller than that of the other corresponding working roll and that only the corresponding working roll with larger diameter is driven, and (3) a method for rolling checkered plates in which the above roll of smaller diameter is used as a grooved roll.
  • FIGS. 4 to 7 show an embodiment of the rolling stand according to the present invention, in which:
  • the diameter of the upper working rolls 1' of the fourth and the fifth rolling stand in the six rolling stands shown in FIG. 4 are chosen smaller than that of the other corresponding working rolls, and as is shown in FIG. 5 only the lower working rolls are to be driven.
  • a large rolling reduction can be obtained by the upper working roll 1' with small diameter. Further, the rolling power hereby is smaller because of the smaller diameter of the roll.
  • FIG. 7 shows another embodiment of the present invention and more precisely a finishing rolling stand of a hot strip rolling mill consisting of six rolling stands used for rolling a checkered plate.
  • the fourth rolling stand is equipped with a working roll with smaller diameter than that of the rolls of other rolling stands, whereby it is characterized that the working roll with smaller diameter is constructed as a roll with grooves corresponding to the patterns of the checkered plate.
  • the grooved roll 1" with small diameter is not directly driven into rotation but by means of the friction with the other flat working roll set corresponding to the grooved roll 1" with small diameter.
  • the checkered plate is, generally speaking, in either of the rolling stands in the latter half of the finishing rolling stands, whereby either the upper or the lower roll is adopted as a grooved roll.
  • the roll interval of the rolling stands after the one equipped with the grooved roll is chosen so large as to allow the plate to pass through freely, whereby the same thing can be said of the rolling stand according to the present invention.
  • one of the features of the present invention relates to the last rolling work of the product, and lies in that as a working roll a roll, with grooves corresponding to the pattern of the checkered plates to give the check pattern to the plates is adopted, and the diameter of the working roll is chosen smaller than that of the other working roll.
  • a smooth operation can be obtained, by making the roll with small diameter freely rotatable, and not driven directly. Nevertheless in case for example the thickness of the plates to be rolled is large, the upper and the lower rolls are brought out of contact with each other after the plate has passed through and do not rotate until the next plate reaches, so that there is a danger that some irregularities should take place when the next plate reaches.
  • the roll balance is cut off immediately after the plate has passed through and the upper and the lower rolls are allowed to come into contact with each other by means of their own weight, to convey the driving power from the working roll, and the roll balance is inserted immediately before the arrival of the material plate in such a manner that the interval between the upper and the lower rolls is properly adjusted.
  • finishing rolling stand of the ordinary hot strip mill is composed of quadruple rolls with a back-up roll 3, whereby the present invention presents no restriction in the composition of the rolls in the rolling stand and further the cutting-off and the insertion of the roll balance can be carried out so that the present invention can be applied to any kind of rolling stand without difficulty.
  • the diameter of one working roll is chosen smaller than that of the other working roll so that a large rolling reduction can be obtained at the side of the roll with smaller diameter, thus in case the smaller diameter roll is a grooved roll, the sufficient height of the uneven pattern namely of the check pattern can be obtained, while in comparison with the rolling reduction the rolling load is small so that the power working upon the grooves of the roll is reduced, bringing about many advantages such as the decrease of the damage of the grooves.
  • EXAMPLE 1 The diameter of the upper working roll of the fifth rolling stand in the tandem rolling stand for the 56" inch hot strip mill consisting of six rolling stands is converted into the one with smaller diameter not to be driven directly.
  • the sizes of the rolls of the then rolling stand are as follows:
  • the temperature at the take-in side of the tandem rolling stand was indicated as high as nearly 1,100C, the rolling condition of the upper and the lower working rolls of the first to the fourth were rolling stand adjusted same, only the upper working roll of the fifth rolling stand was exchanged for the roll with the aforementioned diameter, whereby the rolling load of the fifth rolling stand was adjusted by means of the reduction screw in such a manner that the rolling load of the two kinds of rolls indicated by the load cell became the same.
  • Table 1 The obtained data for rolling is shown in Table 1.
  • the rolling stand of the tandem rolling mill consisting of seven rolling'stands as shown in FIG. 7.
  • the grooved roll was adopted as the upper working roll, whose diameter was a standard diameter of 360 mm.
  • the corresponding lower working roll was a flat roll, whose diameter was 640 mm as usual.
  • the patterns of the grooved roll was checks parallel to the rolling direction, whereby the height (the depth) of the groove was 2.2 mm, the width of the crown 4 mm, the pitch 10 mm and the groove itself was formed trapezoidal. Only the lower flat roll was driven, whilethe upper grooved roll with small diameter was left freely rotatable, not to be driven directly. Further the roll intervals of the rolling stands after the fifth one were chosen sufficient enough to allow the plate to pass through freely.
  • the diameters of the working roll were 597 665 mm, while the length of the cylinder was 1422 mm. Further the diameters of the back-up rolls were 1150 1245 mm, while the length of the cylinder was 1372 mm.
  • the test piece of a slab of very soft rimmed steel (C: 0.08 percent, Mn: 0.36 percent, 16.5 mm thick x 1260 mm wide) was rolled, whereby the temperature at the taker-in side of the finishing rolling stand was 11 10C.
  • the rolling work of the finishing rolling stand several checkered steel plate with thickness (the thickness at deep part) 1.2 4.5 mm were obtained.
  • a process for rolling a thin steel plate by means of a tandem rolling mill having a plurality of rolling stands, each stand having an upper working roll and a lower working roll comprising, reducing the plate through a plurality of front stands having equaldiameter working rolls, reducing the plate through at least one rear stand having working rolls of different diameters, rotating the working rolls of the first stand of said plurality so as to have the largest torque, and rotating the largest of said working rolls of said at least one stand following said first stand so that the torque of said at least one stand is less than half of the torque of said first stand.
  • step of reducing the plate through at least one stand comprises reducing the plate through two stands having an upper working roll of smaller diameter than the lower working roll.
  • step of reducing the plate through at least onestand comprises forming grooves on one of said working rolls of said at least one stand corresponding to a pattern for a checkered plate.
  • a tandem rolling mill for rolling thin steel plates comprising, a plurality of front rolling stands having an upper working roll and a lower working roll of equal diameter, at least one rear rolling stand having an upper working roll and a lower working roll, one of said working rolls having a a smaller diameter than the other, means for driving only the large diameter working roll, the first rolling stand of said plurality having working rolls driven so as to have the largest torque of all the stands, and said means for driving said larger diameter working roll driving said roll at less than half the torque of said first rolling stand.
  • tandem rolling mill according to claim 4, wherein one of said working rolls of said at least one rear rolling stand comprises a grooved roll.
  • tandem rolling mill according to claim 4 comprising two rear rolling stands.
  • tandem rolling mill comprising six rolling stands, said plurality of front rolling stands comprises the first three stands, said two rear rolling stands comprises the fourth and fifth rolling stands, and the sixth rolling stand comprises a rolling stand similar to that of the first rolling stand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US420565A 1972-11-30 1973-11-30 Rolling process and rolling stand of steel plate Expired - Lifetime US3861188A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP47120057A JPS5147421B2 (enrdf_load_stackoverflow) 1972-11-30 1972-11-30
JP48035398A JPS5234022B2 (enrdf_load_stackoverflow) 1972-11-30 1973-03-28

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US3861188A true US3861188A (en) 1975-01-21

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US420565A Expired - Lifetime US3861188A (en) 1972-11-30 1973-11-30 Rolling process and rolling stand of steel plate

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US (1) US3861188A (enrdf_load_stackoverflow)
JP (2) JPS5147421B2 (enrdf_load_stackoverflow)
BR (1) BR7309448D0 (enrdf_load_stackoverflow)
DE (1) DE2359201C2 (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244203A (en) * 1979-03-29 1981-01-13 Olin Corporation Cooperative rolling process and apparatus
US4412439A (en) * 1981-05-04 1983-11-01 Olin Corporation Cooperative rolling mill apparatus and process
US4414832A (en) * 1981-09-11 1983-11-15 Olin Corporation Start-up and steady state process control for cooperative rolling
US4478064A (en) * 1982-03-04 1984-10-23 Olin Corporation Modifications to a cooperative rolling system for increasing _maximum attainable reduction per pass
US4599883A (en) * 1985-07-05 1986-07-15 Wean United, Inc. Tandem rolling mill
US4781050A (en) * 1982-01-21 1988-11-01 Olin Corporation Process and apparatus for producing high reduction in soft metal materials
US4882923A (en) * 1985-02-25 1989-11-28 Nippon Steel Corporation Continuous mill plant for rolling steel plates
US6182490B1 (en) * 1999-03-19 2001-02-06 Danieli Technology Inc. Super thin strip hot rolling
US20030168137A1 (en) * 2001-03-16 2003-09-11 Ichiro Chikushi Apparatus and method for hot rolling
EP1275444A4 (en) * 2000-03-29 2005-09-14 Kawasaki Heavy Ind Ltd METHOD FOR ROLLING SHEET AND ROLLING MILL
US20090165517A1 (en) * 2006-04-05 2009-07-02 Danieli & C. Officine Meccaniche S.P.A. Rolling Plant
WO2009144676A3 (pt) * 2008-05-28 2010-04-08 Universidade De Aveiro Processo de refinamento de grão de elementos metálicos por alteração da trajectória de carga
CN102962253A (zh) * 2012-12-09 2013-03-13 新余钢铁集团有限公司 一种5mm钢板轧制工艺

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52140449A (en) * 1976-05-19 1977-11-24 Ishikawajima Harima Heavy Ind Rolling device
JPS6427705A (en) * 1987-07-23 1989-01-30 Keiichiro Yoshida Method for rolling fine wire and rolling roller unit
JPH07115052B2 (ja) * 1989-04-11 1995-12-13 川崎製鉄株式会社 表面処理鋼板用ｄｒ原板の冷間圧延機
JP7067322B2 (ja) * 2018-07-03 2022-05-16 日本製鉄株式会社 縞鋼板の製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1810167A (en) * 1929-04-10 1931-06-16 Morgan Construction Co Art of rolling metal
US2139872A (en) * 1933-08-07 1938-12-13 Worthington Warren Sheet metal and procedure for producing the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1763279A (en) * 1925-06-20 1930-06-10 American Rolling Mill Co Metal rolling
AT107818B (de) * 1925-08-22 1927-11-10 Heinrich Gruenewald Walzwerk.
DE736880C (de) * 1939-01-06 1943-06-30 Siemag Siegener Maschb Ag Walzwerk mit einer dicken angetriebenen Arbeitswalze und einer als Schleppwalze laufenden, durch zwei Druckrollen abgestuetzten duennen Arbeitswalze

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1810167A (en) * 1929-04-10 1931-06-16 Morgan Construction Co Art of rolling metal
US2139872A (en) * 1933-08-07 1938-12-13 Worthington Warren Sheet metal and procedure for producing the same

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244203A (en) * 1979-03-29 1981-01-13 Olin Corporation Cooperative rolling process and apparatus
US4412439A (en) * 1981-05-04 1983-11-01 Olin Corporation Cooperative rolling mill apparatus and process
US4414832A (en) * 1981-09-11 1983-11-15 Olin Corporation Start-up and steady state process control for cooperative rolling
US4781050A (en) * 1982-01-21 1988-11-01 Olin Corporation Process and apparatus for producing high reduction in soft metal materials
US4478064A (en) * 1982-03-04 1984-10-23 Olin Corporation Modifications to a cooperative rolling system for increasing _maximum attainable reduction per pass
US4882923A (en) * 1985-02-25 1989-11-28 Nippon Steel Corporation Continuous mill plant for rolling steel plates
US4599883A (en) * 1985-07-05 1986-07-15 Wean United, Inc. Tandem rolling mill
US6182490B1 (en) * 1999-03-19 2001-02-06 Danieli Technology Inc. Super thin strip hot rolling
EP1275444A4 (en) * 2000-03-29 2005-09-14 Kawasaki Heavy Ind Ltd METHOD FOR ROLLING SHEET AND ROLLING MILL
US20030168137A1 (en) * 2001-03-16 2003-09-11 Ichiro Chikushi Apparatus and method for hot rolling
US7076983B2 (en) * 2001-03-16 2006-07-18 Nakayama Steel Works, Ltd. Apparatus and method for hot rolling
US20090165517A1 (en) * 2006-04-05 2009-07-02 Danieli & C. Officine Meccaniche S.P.A. Rolling Plant
US8424354B2 (en) * 2006-04-05 2013-04-23 Danieli & C. Officine Meccaniche S.P.A. Rolling plant
WO2009144676A3 (pt) * 2008-05-28 2010-04-08 Universidade De Aveiro Processo de refinamento de grão de elementos metálicos por alteração da trajectória de carga
CN102962253A (zh) * 2012-12-09 2013-03-13 新余钢铁集团有限公司 一种5mm钢板轧制工艺

Also Published As

Publication number Publication date
DE2359201C2 (de) 1981-12-17
JPS49122867A (enrdf_load_stackoverflow) 1974-11-25
JPS4977865A (enrdf_load_stackoverflow) 1974-07-26
BR7309448D0 (pt) 1974-08-29
DE2359201A1 (de) 1974-06-12
JPS5147421B2 (enrdf_load_stackoverflow) 1976-12-15
JPS5234022B2 (enrdf_load_stackoverflow) 1977-09-01

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